* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "huxiaobo-gdh1e91397a5f211c5", "PingFang SC", "Microsoft Yahei", sans-serif;
}

main {
    display: flex;
    background-color: #2f3542;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

h1 {
    color: white;
    font-size: 5em;
    font-weight: 300;
}

span.mark {
    border-right: 2px solid white;
    animation: blink 0.6s step-end infinite;
}

@keyframes blink {
    from,
    to {
        border-color: transparent;
    }
    50% {
        border-color: white;
    }
}